Let-off



July 8. 11 124 v 1.500.273

Y H. J. SATTLER' SR,

' h m-on Filed .Sept. 22. 1923 INVENTOR. 5/1 J 151772612519,

BY l A ATTORNEY.

HERMAN J; SATTLER, SR, or

da m dmaws vamai i Application filed September 22; sria x01664359.

To all whom it may concern, Be it known that HERMAN J. SATTLER, Sn, a citizen of the United States, residing at Quakertown, in the county of Bucks and State of Pennsylvania, has invented certain new and useful Improvements in Let-Offs, of which the following is a specification, reference being had therein to the accom panyi-ngdrawing. l 1 Y This invention relates broadly to that class of'invention known as textile and fabric Weaving machines, but hasmore specific reference to" an improved let-ofi,

which is especially, but not necessarily,

adapted for use; in connection with loom warp-heads:

In producing the present invention, ith'a's been my principal aim togenerally improve upon and to provide a much more simplified structure than'isvembodied in my prior patented let-ofis described and claimed inPatents Numbers 1,019,993, granted tome on March 13, 1912, and 1,418,025, granted to me on May30,1922.-

Generically speaking, thepatented devices referred to comprise a retarding element, preferablya welght, which serves to'mter -mit'tently and periodically apply a retarding eflect or-load to a rotarywarp-head, on

the end of the beam',i-through the medium of a band or its equivalent which slidably surrounds and is relatively movable on'the periphery of the head. fI'n-order toobtain this alternate retarding action, 'novel means is provided for temporarily securing the band to the warp-head at intervals so as to rotate therewith, this lmeans being automatically controlled by the rotation of the head itself and being self-releasedratza predetermined. time; so; that the; aforesaid iretarding element; may 1 additionally: function to,return' theband to its normal position. ?z

More specifically speaking,-the 5 so called securing or E locking means inthese prior .tdevicespositively secures the bandj-ito the FWZLTP-hBEL'ClE by a pivoted release 'pimreceiv- V able inysocketsyin the head-infloneenlbodilicthzo t ejp l di mbodiments ment, and, (in another' embodiment,: a po Ition of the; band? is pressed: oraforced into vfrictionalengagement withwthei head-:3 11 1 single- -.l i g:p in -i ob ine i g In; the present embodiment, which :lsaa decided impro veine1"1t,3{and-g is: muchmore pract ca ;if ricrtaiin-iwo ks," he brb'ad3a EWAgBI lQB 'PQiQPE I QrJQQ OIQ-J u lined exaployed, but" the band is automatically contractible and expansible; that is; it alternately decreases and increases in" diameter jand frictionally' gri s" the warp-head substantially throughout its diameter and the {sin'glepoint' engagement 1 or pressed contact is eliminated; Hence, a comparatively small band can be used to grea'tadvantag'e and an" extremely simple strut r'e will serve; thus decidedly reducingl'thecost 'of manufacture, .yet providing a highlylpracmar device. Also, 'easy'appli'cation and removal of the new device is assured. Other features, and advantages of the invention 'willbe'come' apparent during the course of the following description. In the accompanying drawingsffo'rming a part ofthis specification and inwhi'chlike numerals are-employed to designate like 7 parts throughout the same:

'F'gure" 1 is an endelev'ation'of a warphead, with a portion in section, showing one embodiment of the let-off associated there- I "I -v Fig. 2 is a side or" edge elevation thereof. Fig; 3 is an enlarged 'perspective' view of cooperating details 'of" the contracting means.'-"-" Fig.4 is-a view-like Figure 1 showing a different embodiment of the invention.

" Fig; 5 is a fragmentary side elevation thereof;

In this application, I have illustrated we As before indicated, the invention resides r in the provision-bf a bandor its equivalent 1, which in this instance is circular and sur- Wounds and; seats in i the grooved periphery 0f the'heads The band has its ends 2 spaced :zapartito permit circumferential contraction Fof thesame'pto; obtain the desired uniform frictional: grip, 5 A lug iswfastened to the right hand: end] and this lug icarries spaced ears-'4 between awhi'ch a pendulousl device,- in

s-theiform 10f aslever-5, is pivotedr- Inthis I 1 sconnection,it is 'to be-no'tedthat the upper iendaof the-eleven is rounded as seen "at 6*to provide a cam and is'Spaceddownwardly the body portionkof the lug "to accomwhich passes over the cam. In this embodiment the upper end of the chain carries a cross-pin 8 which has detachable connection with another h1g9 secured to the opposed end of the band. This connection could be of some other construction, but preferably comprises a hook-bolt 10 which is fastened to the lower end of the chain. The threaded end of the bolt extends slidably down through an eye or the like 11 on one edge of the lever. A thumb nut 14: is threaded on the screw-threaded portion of the bolt and bearsragainst the undersideof the eye 11. IVith this construction. it is obvious that the chain can be adjusted for varying the degree of frictional engagement of the band 1 with said head.

A retarding element, preferably in the form of a weight-'15, acts on and is secured to the band by a chain, belt, or its equivalent 16. Also, a counter-weight or'its equivalent 17 is carried by the lever 5. These weights will vary in size to accommodate different circumstances whichare encountered. V

For the purpose of enabling a clear understanding of the invention to be obtained, I have placed I what represent imaginary lines 18, 19 and 20 on the drawing. The line 18 is perpendicular and extends vertically through the axis of the head IVH as shown, while the line 19 is, directed toward the right and is disposed at an acute angle to the line'18 to approximately indicate the normal position of lever 5. The remaining line 20 is directed toward the left and indicates the approximate releasing point of the lever. The aforesaid head rotates in the direction of the arrow A.

The operation is as follows: Assuming that the parts are in the position shown in Fig. 1 it will be seen that the weight 17 on the lower end of the lever will tend to swing the lever toward the line 18, and in so doing will exert an endwise pull on the chain 7, thus drawing the ends 2 of the band together and causing the latter to firmly grip the head. Now, as the head rotates, the friction grip thus obtained will lock the band and the weight 15 will elevate, thus momentarily retarding the rotation of the head and placing the thread under tension. At the same time, the lever 5 and its weight 17 will move successively into substantial parallelism with lines 18 and 20. When it reaches the last named line, the lever will swingretrogradely and. the chain 7 will slacken, thus loosening the friction grip sufficiently to permit the weight 15 to bodily shift the device so'thatthe parts assume their normal positions. Consequently, the desired let-off action-is produced as in the aforesaid patented devices.

It: is obvious that by properly adjusting the band 1 by manipulating the nut14, the

tension of the band can be regulated at will. It is also apparent that the contraction of the band is produced by the cam action of the lever on the chain passing over 24 is pivoted to the lug 22 and has its curved cam-end 24 spaced therefrom to accommodate the chain 25 which in this instance is permanently fastened to the lever 23 and passes slidably over said rounded end. The upper free end of the chain carries: the hookbolt 26 which passed through spaced depending furcations on the lug' 23. The adjusting nut 28 acts against a comparatively small cross-pin 29 on the hook which bears against and extends cross-wise of said furcations. The weight (not shown) is fastened to the belt through the medium of a belt, chain, or the like'30.

The operation of this form of the device is however the same as described before.

The several features and advantages of the invention have been made clear and it is evident that I have evolved and produced a very practical and advantageous device. For instance, this new structure will allow a much larger range and a variety in size and it will permit use of a small round belt with a small weight of one-half pound or less on a very small edge-warp and will operate quite as efficiently as when a Hat belt of several inches wide and a very heavy weight is employed.

Although specific embodiments of the invention have been described and shown, it is to be understood that various minor changes in size, shape and arrangement of parts may be resorted to so long as no departure from the subjoined claims is made.

. I claim:

1. The combination with a warp-head; of a friction band surrounding the periphery of said head and having its ends spaced apart, and means controlled by the rotation of sald head for causing saidends to approach one another at predetermined in' tervals, whereby to radially tighten said;

band around the head to obtain a frictional grip from end to end of the band. 7 2. In a let-ofi, 'a radially expansible and contractible friction grip device adapted to be' mounted on awarp-head, and means controlled by the rotation of the latter for periodicallyand automatically: expanding and contracting said device.

3. The structure specified in. claim 2, to-

'gether with a retarding element associated with said device, said element also serving to circumferentially shift and return said device to its normal position at predetermined intervals.

4. A let-ofi comprising a transversely split friction band adapted to surround a warp-head, the ends of said band being spaced apart, a retarding element connected to said band, said element serving also to move said band circumferentially relative to the head, and means controlledby the rotation of the latter for moving the bandends toward each other, whereby to cause the band to contract and frictionally grip the head throughout its circumference and to apply the retarding action of the weight.

5. A let-ofi for warp-heads comprising a retarding weight, means controlled by the rotation of the warp-head for applying the effect of the weight to the latter, and a radially expansible and contractible friction grip device for mounting said weight and means on said head.

6. A let-01f for warp-heads comprising a transversely split band to encircle said head, and automatically operable expanding and contracting means associated with the opposed ends of said band. i

7. The structure set forth in claim 6, said means comprising a pivoted lever and a connection between the lever and band.

8. A let-ofl for loom warp-heads comprising a band adapted to surround the periphery of said head, said band being transversely split and the ends thereof being spaced apart, a lever pivoted to one of said ends, and a flexible and adjustable connection between said lever and said other end, said connection being alternately rendered taut and slack by the swing of said lever.

9. A let-off for loom warp-heads com-p rising a band to surround said head, said Eand being transversely split and the opposed ends thereof being spaced apart, a

counterbalanced lever pivoted to one end of the band, and a connection between said lever and the remaining end of said band,

ing rounded and spaced from the band, and

a connection between said lever and the remaining end of said band, said connection passing over the upper rounded end of the lever so that it will be alternately rendered taut and slack by the swing of the lever.

11. A let-01f comprising a circular transversely split band, lugs secured to the ends of said band; a depending lever pivoted at its upper end to one of said lugs, said pivoted end being rounded and spaced downwardly from the lug, a longitudinally adjustable flexible element having connection with the other lug, said element passing over said rounded end of the lever and being connected at its opposite end to the intermediate portion of the lever, and a weight connected with said band for moving it circumferentially relative to the part which it surrounds. I

12. A let-ofl' comprising a transversely split band to surround a warp-head, the ends of said band being spaced apart, a ivoted depending lever carried by one en of the band, a lug secured to the other end of the band, and adjustable connecting means associated with said lug and the first named end of the band.

In testimony whereof I hereunto afiix my signature.

HERMAN J. SATTLER, SR.

and slack by the swing of 

